The Vaavud wind meter is a revolutionary product that can turn your phone into high-tech meteorological tool. It’s compatible with iPhones and Android operating system devices. This device don’t contain any electronics as it uses magnetic field sensor placed in the phone. Design has been inspired by pro cup anemometers. However, to make this device super rugged and pocket friendly, two instead of three cups are used. This device measures wind strength accurately with precision of +/- 4%. Reads wind speeds from 2 – 20 m/s (up to 24 m/s on iPhone 5S and up to even 48 m/s on some Android phones). Features handy, useful neoprene bag so you can take it everywhere with you.